Laboratory Safety and Procedures

What is the purpose of the two holes in the lid of the calorimeter?

• To release steam

• To add more water

• To insert a thermometer and a stirring rod

• To allow air circulation

Why is it important to weigh the metal sample accurately?

• To calculate the exact amount of heat absorbed

• To ensure it fits in the test tube

• To prevent it from floating

• To make it easier to handle

What precaution should be taken when pouring the metal into the test tube?

• Pour it at an angle to prevent breaking the test tube

• Pour it directly from a height

• Pour it slowly to avoid splashing

• Pour it quickly to avoid cooling

Why is it necessary to measure the initial temperature of the water in the calorimeter?

• To check if the thermometer is working

• To calculate the temperature change after adding the metal

• To compare with room temperature

• To ensure it is at boiling point

What is the main objective of Part B of the experiment?

• To calculate the mass of a solid

• To determine the density of a solid

• To find the enthalpy of solution of a solid

• To measure the boiling point of water

Why is it important to tare the weighing boat before adding the solid?

• To ensure accurate measurement of the solid's mass

• To prevent the solid from sticking

• To make the balance more stable

• To avoid damaging the balance

What should be done if the balance overloads while weighing the water?

• Increase the balance capacity

• Use a larger beaker

• Use a triple beam balance

• Reduce the amount of water

What safety precautions should be taken when handling HCl and NaOH solutions?

• Use gloves and goggles

• Store in a cool, dry place

• Work in a well-ventilated area

• Keep away from open flames

What is the expected outcome when HCl and NaOH are mixed in the calorimeter?

• A color change

• An increase in temperature

• No temperature change

• A decrease in temperature

Why is it important to measure the peak temperature during the reaction?

• To determine the reaction rate

• To calculate the enthalpy change

• To ensure the reaction is complete

• To verify the initial temperature